She's just far too shy and modest to start blurting things out the way Buffy does. Most of the time, she doesn't regret her decisions and sticking her foot in her mouth has no adverse affects other than embarrassment. She'll likely never learn to filter herself and she's not terribly interested in trying.

Indeed it is. Considering Buffy has a boyfriend 'back home', it's quite the problem.

She nods a little, aware of that. "Yeah. I work with Alcide and he's my room mate so I'm not going to be able to avoid him for long." She tilts her head a little at Katniss. "He's a good guy, Derek. He's probably my best friend here so be nice to him. He deserves it."